Turner T M, Urban R M, Sumner D R, Skipor A K, Galante J O
Department of Orthopedic Surgery, Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois 60612.
J Orthop Res. 1989;7(6):893-901. doi: 10.1002/jor.1100070616.
The purpose of this study was to evaluate the occurrence of bone ingrowth in a porous coated tibial component of a canine total condylar design knee replacement model. The entire undersurface of the tibial prosthesis was covered by a titanium fiber metal porous composite pad. Projecting from this surface were three short, cylindrical, fiber metal coated pegs that along with a posterior screw provided initial stabilization of the device. Left total knee replacements were performed on six dogs using alignment and cutting jigs to prepare the bony surfaces. The dogs were killed 6 months following surgery. Extensive bone ingrowth was present in all pegs of every tibial component. Bone ingrowth was present in 12% of the pad area of one component, 22.7 to 41.6% in four components, and 81.1% in another. The void spaces in other areas were filled with fibrous tissue or in the periphery of the device with fibrocartilage. Bone ingrowth in the pad was consistent in the vicinity of the pegs and was variable in regions not adjacent to the pegs, suggesting that the pegs exerted a strong influence on the pattern of bone ingrowth into the pad.
本研究的目的是评估在犬全髁型膝关节置换模型的多孔涂层胫骨部件中骨长入的发生情况。胫骨假体的整个下表面覆盖有钛纤维金属多孔复合垫。从该表面伸出三个短的圆柱形纤维金属涂层栓柱，这些栓柱与一个后螺钉一起为装置提供初始稳定性。使用对线和切割夹具对六只狗进行左全膝关节置换，以准备骨表面。术后6个月处死这些狗。每个胫骨部件的所有栓柱中均存在广泛的骨长入。一个部件的垫区域有12%出现骨长入，四个部件的骨长入率为22.7%至41.6%，另一个部件为81.1%。其他区域的空隙充满纤维组织，或在装置周边充满纤维软骨。垫中的骨长入在栓柱附近是一致的，在不相邻于栓柱的区域则是可变的，这表明栓柱对骨长入垫的模式有强烈影响。
